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This is a 20 mm diameter fuel pellet, note that the central temperature is very different for the different fuel solids, also for the different pellets it has the lowest centre line temperature, power density is 250 W per cubic meter and rim temperature of 200 °C

250 W/cubic meter is orders of magnitude too low: less than 2.5 W/square meter of pellet surface, with a temperature gradient > 1000 K/cm... No. I've removed this number, since it's better to leave out a quantity than to have one that is grossly wrong. The number could be calculated, approximately, from the data in the preceding graph. —Preceding unsigned comment added by 67.117.131.179 (talk) 04:56, 20 May 2011 (UTC)